L-DK Hitotsu Yane no Shita, (Suki) ga Futatsu

Aoi Nishimori and Shusei Kugayama are in love and they begin to live together secretly. Suddenly, Shusei's cousin Reon Kugayama comes to them. Their secret is discovered by Reon. Now, Aoi, Shusei and Reon begin to live together.